linux-kernel - Re: [PATCH v4] rust: check type of `$ptr` in `container

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Message-ID: <CANiq72mKAt0W_L2L8DX_xpTqxX9CVR_ZJA62C0VM40zF2qwCAg@mail.gmail.com>
Date: Thu, 29 May 2025 15:24:52 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Tamir Duberstein <tamird@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, Benno Lossin <lossin@...nel.org>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] rust: check type of `$ptr` in `container_of!`

On Thu, May 29, 2025 at 3:11 PM Tamir Duberstein <tamird@...il.com> wrote:
>
> Add a compile-time check that `*$ptr` is of the type of `$type->$($f)*`.
> Rename those placeholders for clarity.

I had a variation of v1 already applied locally, let me push and you
can take a look.

> +/// Helper for `container_of!`.
> +#[doc(hidden)]
> +pub fn assert_same_type<T>(_: T, _: T) {}

I meant to have a proper function, possibly "public" (not hidden I
mean). We can do that later, no worries.

Cheers,
Miguel